Page:Freud - Group psychology and the analysis of the ego.djvu/16

4 and offers to investigators countless problems which have hitherto not even been properly distinguished from one another. The mere classification of the different forms of group formation and the description of the mental phenomena produced by them require a great expenditure of observation and exposition, and have already given rise to a copious literature. Anyone who compares the narrow dimensions of this little book with the extent of Group Psychology will at once be able to guess that only a few points chosen from the whole material are to be dealt with here. And they will in fact only be a few questions with which the depth-psychology of psycho-analysis is specially concerned.